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kubeconfig_test.go
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kubeconfig_test.go
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// Reference Implementation taken from Minikube
// https://github.com/kubernetes/minikube/blob/master/pkg/minikube/kubeconfig/config_test.go
package main
import (
"io/ioutil"
"os"
"path/filepath"
"testing"
"k8s.io/client-go/tools/clientcmd/api"
)
var fakeKubeCfg = []byte(`
apiVersion: v1
clusters:
- cluster:
certificate-authority: /tmp/apiserver.crt
server: 192.168.1.1:8080
name: kubed
contexts:
- context:
cluster: kubed
user: kubed
name: kubed
current-context: kubed
kind: Config
preferences: {}
users:
- name: kubed
user:
client-certificate: /tmp/apiserver.crt
client-key: /tmp/apiserver.key
`)
func TestSetupKubeConfig(t *testing.T) {
setupCfg := &KubeConfigSetup{
ClusterName: "test",
ClusterServerAddress: "192.168.1.1:8080",
CertificateAuthorityData: []byte("testing.crt"),
Token: "test-token",
kubeConfigFile: "/tmp/.kube/config",
KeepContext: false,
}
var tests = []struct {
description string
cfg *KubeConfigSetup
existingCfg []byte
expected api.Config
err bool
}{
{
description: "new kube config",
cfg: setupCfg,
},
{
description: "add to kube config",
cfg: setupCfg,
existingCfg: fakeKubeCfg,
},
{
description: "use config env var",
cfg: setupCfg,
},
{
description: "keep context",
cfg: &KubeConfigSetup{
ClusterName: "test",
ClusterServerAddress: "192.168.1.1:8080",
CertificateAuthorityData: []byte("testing.crt"),
Token: "test-token",
kubeConfigFile: "/tmp/.kube/config",
KeepContext: true,
},
existingCfg: fakeKubeCfg,
},
}
for _, test := range tests {
t.Run(test.description, func(t *testing.T) {
t.Parallel()
tmpDir, err := ioutil.TempDir("", "")
if err != nil {
t.Fatalf("Error making temp directory %s", err)
}
if len(test.existingCfg) != 0 {
ioutil.WriteFile(test.cfg.kubeConfigFile, test.existingCfg, 0600)
}
err = SetupKubeConfig(test.cfg)
if err != nil && !test.err {
t.Errorf("Got unexpected error: %s", err)
}
if err == nil && test.err {
t.Errorf("Expected error but got none")
}
config, err := ReadConfigOrNew(test.cfg.kubeConfigFile)
if err != nil {
t.Errorf("Error reading kubeconfig file: %s", err)
}
if test.cfg.KeepContext && config.CurrentContext == test.cfg.ClusterName {
t.Errorf("Context was changed even though KeepContext was true")
}
if !test.cfg.KeepContext && config.CurrentContext != test.cfg.ClusterName {
t.Errorf("Context was not switched")
}
os.RemoveAll(tmpDir)
})
}
}
func TestEmptyConfig(t *testing.T) {
tmp := tempFile(t, []byte{})
defer os.Remove(tmp)
cfg, err := ReadConfigOrNew(tmp)
if err != nil {
t.Fatalf("could not read config: %v", err)
}
if len(cfg.AuthInfos) != 0 {
t.Fail()
}
if len(cfg.Clusters) != 0 {
t.Fail()
}
if len(cfg.Contexts) != 0 {
t.Fail()
}
}
func TestNewConfig(t *testing.T) {
dir, err := ioutil.TempDir("", ".kube")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dir)
// setup minikube config
expected := api.NewConfig()
kubedConfig(expected)
// write actual
filename := filepath.Join(dir, "config")
err = WriteConfig(expected, filename)
if err != nil {
t.Fatal(err)
}
actual, err := ReadConfigOrNew(filename)
if err != nil {
t.Fatal(err)
}
if !configEquals(actual, expected) {
t.Fatal("configs did not match")
}
}
// tempFile creates a temporary with the provided bytes as its contents.
// The caller is responsible for deleting file after use.
func tempFile(t *testing.T, data []byte) string {
tmp, err := ioutil.TempFile("", "kubeconfig")
if err != nil {
t.Fatal(err)
}
if len(data) > 0 {
if _, err := tmp.Write(data); err != nil {
t.Fatal(err)
}
}
if err := tmp.Close(); err != nil {
t.Fatal(err)
}
return tmp.Name()
}
// kubedConfig returns a config that reasonably approximates a localkube cluster
func kubedConfig(config *api.Config) {
// cluster
clusterName := "kubed"
cluster := api.NewCluster()
cluster.Server = "https://192.168.99.100:8080"
cluster.CertificateAuthorityData = []byte("testing.crt")
config.Clusters[clusterName] = cluster
// user
userName := "kubed"
user := api.NewAuthInfo()
user.Token = "test-token"
config.AuthInfos[userName] = user
// context
contextName := "kubed"
context := api.NewContext()
context.Cluster = clusterName
context.AuthInfo = userName
config.Contexts[contextName] = context
config.CurrentContext = contextName
}
// configEquals checks if configs are identical
func configEquals(a, b *api.Config) bool {
if a.Kind != b.Kind {
return false
}
if a.APIVersion != b.APIVersion {
return false
}
if a.Preferences.Colors != b.Preferences.Colors {
return false
}
if len(a.Extensions) != len(b.Extensions) {
return false
}
// clusters
if len(a.Clusters) != len(b.Clusters) {
return false
}
for k, aCluster := range a.Clusters {
bCluster, exists := b.Clusters[k]
if !exists {
return false
}
if aCluster.LocationOfOrigin != bCluster.LocationOfOrigin ||
aCluster.Server != bCluster.Server ||
aCluster.APIVersion != bCluster.APIVersion ||
aCluster.InsecureSkipTLSVerify != bCluster.InsecureSkipTLSVerify ||
aCluster.CertificateAuthority != bCluster.CertificateAuthority ||
len(aCluster.CertificateAuthorityData) != len(bCluster.CertificateAuthorityData) ||
len(aCluster.Extensions) != len(bCluster.Extensions) {
return false
}
}
// users
if len(a.AuthInfos) != len(b.AuthInfos) {
return false
}
for k, aAuth := range a.AuthInfos {
bAuth, exists := b.AuthInfos[k]
if !exists {
return false
}
if aAuth.LocationOfOrigin != bAuth.LocationOfOrigin ||
aAuth.ClientCertificate != bAuth.ClientCertificate ||
len(aAuth.ClientCertificateData) != len(bAuth.ClientCertificateData) ||
aAuth.ClientKey != bAuth.ClientKey ||
len(aAuth.ClientKeyData) != len(bAuth.ClientKeyData) ||
aAuth.Token != bAuth.Token ||
aAuth.Username != bAuth.Username ||
aAuth.Password != bAuth.Password ||
len(aAuth.Extensions) != len(bAuth.Extensions) {
return false
}
}
// contexts
if len(a.Contexts) != len(b.Contexts) {
return false
}
for k, aContext := range a.Contexts {
bContext, exists := b.Contexts[k]
if !exists {
return false
}
if aContext.LocationOfOrigin != bContext.LocationOfOrigin ||
aContext.Cluster != bContext.Cluster ||
aContext.AuthInfo != bContext.AuthInfo ||
aContext.Namespace != bContext.Namespace ||
len(aContext.Extensions) != len(bContext.Extensions) {
return false
}
}
return true
}